Rovio Mobile have today released Angry Birds Seasons as an update to the smash hit Angry Birds Halloween, which is exclusively available in the App Store for Apple iOS devices.

In addition to the 45 levels playable on Angry Birds Halloween, players will wake up to a new level each day on the advent calender style 'Seasons Greedings' section. There are 25 new levels but don't think your lunch break is now going to be filled as you will have to wait until the next day to unlock the next level.

If you had already purchased Angry birds Halloween this update will be free , or you can download Angry Birds Seasons for a bargain $0.99. From what we have seen so far, the new levels look like a winter wonderland where snow falls from the sky as you squash those egg stealing pigs.  Extra points are available for smashing the gift boxes throughout the new levels. Rovio also promises, "A very merry Golden Egg full of holiday spirit," which we cannot wait to see.

Angry Birds Seasons

There doesn't seem to be any new bird types, but seeing as its in the style of an advent calender and remembering how generous Rovio Mobile have been previously with updates on all Angry Birds games, we wouldn't be surprised to see  some sort of Christmas bird that shoots Christmas candy cane from the skies at some point this month.

This caps off an incredible year for Rovio Mobile, where Angry Birds has been sitting pretty in the top of the App Store since it's release. The title was only recently toppled for a short time by the fantastic Cut the Rope. The game was also recently released for Android, and has already been downloaded there over 7 million times.

There's no doubting the charm of Angry Birds and its a simple yet fun concept, which has resonated with millions upon millions of people from all walks of life around the globe. Even the most adamant non-gamers have been transformed into Angry Birds addicts and we will be very much looking forward to a rabbit busting, egg smashing Easter update to Angry Birds Seasons in 2011.

Angry Birds Seasons is available now in the Apple App Store for $0.99 for the iPhone and iPod Touch and $1.99 for the HD iPad version. Requires iOS 3.0 or later.

What do you think of the Angry Birds update? Do you think we will get a new bird as a Christmas present from Rovio Mobile? Let us know in the comments below.